The Direct Strength Method (DSM) in AISI S100 and AS/NZS 4600 is a newly developed alternative design method to the Effective Width Method in calculating the design moment capacity of cold-formed steel channels. The DSM uses elastic buckling stresses with an appropriate strength curve to calculate the design moment capacity. However, the current DSM design equation has been calibrated for channels bent about the major axis and is known to be conservative for channels bent about the minor axis with the web in compression. In order to extend the DSM for channels bent about the minor axis, it is necessary to prescribe and calibrate a DSM design equation for minor axis bending. This paper aims at deriving a new DSM design equation for cold-formed steel channels bent about the minor axis with the web in compression. For this purpose, the behaviour of 33 cold-formed steel channels bent about the minor axis inducing local buckling in the web are investigated using elastic finite strip buckling analysis and nonlinear finite element analysis. The cross-sectional dimensions such as thickness, web and flange widths are varied to cover a wide range of section slenderness. Deformed shapes and stress distributions at ultimate moment for various channels of different slenderness are described. Due to the considerable conservatism the current DSM design equation exhibited in comparison to the nonlinear finite element analysis results, a new DSM design equation for cold-formed steel channels bent about the minor axis is proposed.

AISI S100和AS / NZS 4600中的直接强度法（DSM）是一种新的替代设计方法，用于计算冷弯型钢通道的设计弯矩能力时的有效宽度法。DSM使用具有适当强度曲线的弹性屈曲应力来计算设计弯矩承载力。但是，当前的DSM设计公式已针对绕主轴弯曲的通道进行了校准，并且已知对于在腹板处于压缩状态时绕短轴弯曲的通道是保守的。为了将DSM扩展到围绕短轴弯曲的通道，必须规定和校准DSM设计公式以进行短轴弯曲。本文旨在推导一个新的DSM设计公式，用于在腹板处于压缩状态下绕短轴弯曲的冷弯型钢通道。以此目的，利用弹性有限条带屈曲分析和非线性有限元分析方法，研究了33条沿短轴弯曲引起钢网局部屈曲的冷弯型钢通道的行为。改变横截面尺寸，例如厚度，腹板和凸缘宽度，以覆盖宽范围的截面细长度。描述了不同细长度的各种通道在最终时刻的变形形状和应力分布。鉴于目前的保守性，与非线性有限元分析结果相比，目前的DSM设计方程式更为合理，因此提出了一种新的DSM设计方程式。